Abstract: Light scattering is ubiquitous, both in Nature and applications. I will report about the results obtained in the recent years exploiting the fundamentals of light scattering to the study, characterization and applications of nano- and micro-particles.

Mr. Siano's Talk:

Title: Wavefront characterization of partially coherent light

Date: 13.12.2016

Time: 14:00-15:00

Location: Seminar Room Leibniz Haus

Abstract: Wavefront characterization is of fundamental importance in many applications and research areas, e.g coherent and incoherent imaging, phase-sensitive techniques, optics metrology, beam diagnostics. In the first part of this seminar we show how to probe wavefront phase correlations (coherence properties) of radiation beams in third and fourth-generation light sources with the Heterodyne Near Field Speckle method. Experimental results obtained with undulator radiation at ESRF, SASE FEL at SPARC_LAB and synchrotron radiation at ALBA are provided. We also introduce the novel Asymmetric Lateral Coherence approach, which exploits many asymmetric Young’s interferometers to retrieve spatial features of broadband sources. In the second part of this seminar we address the problem of wavefront phase sensing and reconstruction. We focus on vortex beams, i.e. light carrying Orbital Angular Momentum, describing their generation and the current diagnostics to evidence the phase helicity.

Biographies: Marco Potenza graduated in Astroparticle Physics in 1996 and obtained the PhD in Optics in 2000. Since 2004 is developing optical instrumentation for ESA and new methods for the characterization of partially coherent X-rays. In recent years he adopted the approach of the analogical simulations to study, for example, radiative transfer in a cloud and X-ray radiation sources. He is currently holding the position of group leader at the "Instrumental Optics Laboratory” of the University of Milan, Italy.

Mirko Siano is a PhD student at the PhD School of Physics, Astrophysics and Applied Physics of the University of Milan. He graduated in Optics at the University of Milan with a thesis about the characterization of the spatial and temporal coherence of X ray beams from third and fourth generation sources.